Photo of the Day: Mission San Xavier del Bac in Tucson, Ariz.

Award winners were determined based on a combination of travelers’ favorite places and overall destination popularity.

Amid the Cold War, the country established a series of 54 Titan II intercontinental ballistic missile silos. One of the missiles, formerly site No. 571-7, is preserved as the Titan Missile Museum.

“The Town Too Tough to Die” is best known for the events of Oct. 28, 1881, when Wyatt Earp, his brothers and Doc Holliday gunned down three cowboys in what is remembered as the “Gunfight at the OK Corral.”